Hello,
Charles, I don't need a lesson in drilling holes! If you think a softwood 4 by 2 would stay accurate enough to drill 30 plus holes with an auger, then I wonder how much experience you actually have at this wood working thing. I actually used a rather better piece of beech hardwood, drilled dead plumb with a rather good old drill press. However, augers have their lands relieved, to avoid too much friction in the holes, so in use, there is a little slop hence slight drilling error, which is multiplied over many holes. Then, iif you think anything can drill a whole matrix of holes across a 7 feet by 16 in area, other than CNC, so that 2 fixed posts will fit into any and every hole combination, then you are naive to say the least. You are not even considering seasonal movement, which will make all the hole spacing across the width change continuallly. The devices are well thought out, but in your hurry to condemn every new twist on an old idea, you seem to have given the details no thought. I'm not a beginner, Charles, and I know what I'm doing and that woodwork is not engineering. The tools we often use to help us do it well, however, often are engineered. And don't forget, I'm not trying to persuade anyone to have these things, I just thought It might be useful for some to hear about my bench adaption, which had to be done out of the necessity of having a smaller workshop and having to accommodate storage into a bench which previously had none. Hence altering the dog holes so that dogs did not stick out under the bench top.
Mike.